Fix incorrect year in some copyright notices

A couple of new files have been added in the tree with a copyright year
of 2024 while we were already in 2025.  These should be marked with
2025, so let's fix them.

Reported-by: Shaik Mohammad Mujeeb <mujeeb.sk.dev@gmail.com>
Discussion: https://postgr.es/m/CALa6HA4_Wu7-2PV0xv-Q84cT8eG7rTx6bdjUV0Pc=McAwkNMfQ@mail.gmail.com

contrib/sepgsql/t/001_sepgsql.pl

@@ -1,5 +1,5 @@
 
-# Copyright (c) 2024, PostgreSQL Global Development Group
+# Copyright (c) 2024-2025, PostgreSQL Global Development Group
 
 use strict;
 use warnings FATAL => 'all';

src/include/access/gin_tuple.h

@@ -2,7 +2,7 @@
  * gin.h
  *	  Public header file for Generalized Inverted Index access method.
  *
- *	Copyright (c) 2006-2024, PostgreSQL Global Development Group
+ *	Copyright (c) 2006-2025, PostgreSQL Global Development Group
  *
  *	src/include/access/gin.h
  *--------------------------------------------------------------------------

src/include/storage/waiteventset.h

@@ -15,7 +15,7 @@
  * functions.
  *
  *
- * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/include/storage/waiteventset.h

src/port/pg_localeconv_r.c

@@ -3,7 +3,7 @@
  * pg_localeconv_r.c
  *    Thread-safe implementations of localeconv()
  *
- * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *